# How to factor #2x^2+x-1# ?

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i tried to factor it and i got #(2x+1)(x-1)#

but my friend said the correct answer is #(2x-1)(x+1)#

i tried to factor it and i got

but my friend said the correct answer is

##### 1 Answer

#### Answer:

#### Explanation:

Factor:

The method to use is called "splitting the middle term."

Multiply the coefficient of the first term by the constant.

Find two number that when added equal

Rewrite the expression, splitting the middle term

Factor out the common terms in the first two terms and the second two terms.

Factor out